See post #8. Pretty funny. I've used Bosch and NGK's (both non-resistor coppers), and I've never noticed much of a difference. What I have noticed, however, is people slamming Bosch's quality, and people slamming NGK's for just being Japanese. Others are also saying that only Bosch makes non-resistor plugs.... Lots of un-substantiated info based on baseless biases (I personally have non-resistor NGK's, but I wouldn't hesitate putting in Bosch if I had 'em).